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map, filter and cat return an iterator

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This commit is contained in:
Celestino Amoroso
2026-05-09 17:42:04 +02:00
parent e5a61b5638
commit 45faea7620
6 changed files with 182 additions and 90 deletions
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operator-map.go
+25 -24
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@@ -6,7 +6,6 @@ package expr
import (
"fmt"
"io"
"git.portale-stac.it/go-pkg/expr/kern"
"git.portale-stac.it/go-pkg/expr/scan"
@@ -25,9 +24,10 @@ func newMapTerm(tk *scan.Token) (inst *scan.Term) {
}
func evalMap(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
var leftValue, rightValue any
// var leftValue, rightValue any
var leftValue any
var it kern.Iterator
var item any
// var item any
var ok bool
if err = opTerm.CheckOperands(); err != nil {
@@ -44,27 +44,28 @@ func evalMap(ctx kern.ExprContext, opTerm *scan.Term) (v any, err error) {
}
}
values := kern.NewListA()
for item, err = it.Next(); err == nil; item, err = it.Next() {
ctx.SetVar("_", item)
ctx.SetVar("__", it.Index())
ctx.SetVar("_#", it.Count())
if rightValue, err = opTerm.Children[1].Compute(ctx); err == nil {
values.AppendItem(rightValue)
}
ctx.DeleteVar("_#")
ctx.DeleteVar("__")
ctx.DeleteVar("_")
if err != nil {
break
}
}
if err == io.EOF {
err = nil
}
if err == nil {
v = values
}
// values := kern.NewListA()
// for item, err = it.Next(); err == nil; item, err = it.Next() {
// ctx.SetVar("_", item)
// ctx.SetVar("__", it.Index())
// ctx.SetVar("_#", it.Count())
// if rightValue, err = opTerm.Children[1].Compute(ctx); err == nil {
// values.AppendItem(rightValue)
// }
// ctx.DeleteVar("_#")
// ctx.DeleteVar("__")
// ctx.DeleteVar("_")
// if err != nil {
// break
// }
// }
// if err == io.EOF {
// err = nil
// }
// if err == nil {
// v = values
// }
v, err = NewIterIter(it, ctx, opTerm.Children[1:])
return
}